bsd/netat/atp_alloc.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*    Modified for MP, 1996 by Tuyen Nguyen */
  23 /*
  24  *      tcb (transaction) allocation routine. If no transaction data structure
  25  *              is available then put the module on a queue of modules waiting
  26  *              for transaction structures. When a tcb is available it will be
  27  *              removed from this list and its write queue will be scheduled.
  28  *      Version 1.4 of atp_alloc.c on 89/02/09 17:53:01
  29  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
  30  */
  31 #include <sys/errno.h>
  32 #include <sys/types.h>
  33 #include <sys/param.h>
  34 #include <machine/spl.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/proc.h>
  38 #include <sys/filedesc.h>
  39 #include <sys/fcntl.h>
  40 #include <sys/mbuf.h>
  41 #include <sys/socket.h>
  42
  43 #include <netat/sysglue.h>
  44 #include <netat/appletalk.h>
  45 #include <netat/ddp.h>
  46 #include <netat/debug.h>
  47 #include <netat/at_pcb.h>
  48 #include <netat/atp.h>
  49
  50 /*### MacOSX MCLBYTE is 2048, not 4096 like AIX */
  51 #define TRPS_PER_BLK 16
  52
  53 gbuf_t *atp_resource_m = 0;
  54 extern atlock_t atpgen_lock;
  55
  56 struct atp_trans *atp_trans_alloc(atp)
  57 struct  atp_state *atp;
  58 {
  59         int s;
  60         int i;
  61         gbuf_t *m;
  62         register struct atp_trans *trp, *trp_array;
  63
  64         ATDISABLE(s, atpgen_lock);
  65         if (atp_trans_free_list == 0) {
  66                 ATENABLE(s, atpgen_lock);
  67                 if ((m = gbuf_alloc(TRPS_PER_BLK*sizeof(struct atp_trans),PRI_HI)) == 0)
  68                         return (struct atp_trans *)0;
  69                 bzero(gbuf_rptr(m), TRPS_PER_BLK*sizeof(struct atp_trans));
  70                 trp_array = (struct atp_trans *)gbuf_rptr(m);
  71                 for (i=0; i < TRPS_PER_BLK-1; i++)
  72                         trp_array[i].tr_list.next = (struct atp_trans *)&trp_array[i+1];
  73                 ATDISABLE(s, atpgen_lock);
  74                 gbuf_cont(m) = atp_resource_m;
  75                 atp_resource_m = m;
  76                 trp_array[i].tr_list.next = atp_trans_free_list;
  77                 atp_trans_free_list = (struct atp_trans *)&trp_array[0];
  78         }
  79
  80         trp = atp_trans_free_list;
  81         atp_trans_free_list = trp->tr_list.next;
  82         ATENABLE(s, atpgen_lock);
  83         trp->tr_queue = atp;
  84         trp->tr_state = TRANS_TIMEOUT;
  85         trp->tr_local_node = 0;
  86         ATLOCKINIT(trp->tr_lock);
  87         ATEVENTINIT(trp->tr_event);
  88
  89         dPrintf(D_M_ATP_LOW, D_L_TRACE,
  90                 ("atp_trans_alloc(0x%x): alloc'd trp 0x%x\n",
  91                  (u_int) atp, (u_int) trp));
  92         return trp;
  93 } /* atp_trans_alloc */
  94
  95 /*
  96  *      tcb free routine - if modules are waiting schedule them
  97  *      always called at 'lock'
  98  */
  99
 100 void atp_trans_free(trp)
 101 register struct atp_trans *trp;
 102 {
 103         int s;
 104
 105         ATDISABLE(s, atpgen_lock);
 106         trp->tr_queue = 0;
 107         trp->tr_list.next = atp_trans_free_list;
 108         atp_trans_free_list = trp;
 109         ATENABLE(s, atpgen_lock);
 110 }
 111
 112 /*
 113  *      This routine allocates a rcb, if none are available it makes sure the
 114  *              the write service routine will be called when one is
 115  *      always called at 'lock'
 116  */
 117
 118 struct atp_rcb *atp_rcb_alloc(atp)
 119 struct  atp_state *atp;
 120 {
 121         register struct atp_rcb *rcbp;
 122         int s;
 123
 124         ATDISABLE(s, atpgen_lock);
 125         if ((rcbp = atp_rcb_free_list) != NULL) {
 126                 atp_rcb_free_list = rcbp->rc_list.next;
 127                 rcbp->rc_queue = atp;
 128                 rcbp->rc_pktcnt = 0;
 129                 rcbp->rc_local_node = 0;
 130         }
 131         ATENABLE(s, atpgen_lock);
 132         dPrintf(D_M_ATP_LOW, D_L_TRACE,
 133                 ("atp_rcb_alloc: allocated rcbp 0x%x\n", (u_int) rcbp));
 134         return(rcbp);
 135 }
 136
 137 /*
 138  *      Here we free rcbs, if required reschedule other people waiting for them
 139  *      always called at 'lock'
 140  */
 141
 142 void atp_rcb_free(rcbp)
 143 register struct atp_rcb *rcbp;
 144 {
 145         register struct atp_state *atp;
 146         register int i;
 147         register int rc_state;
 148         int s;
 149
 150         dPrintf(D_M_ATP_LOW, D_L_TRACE,
 151                 ("atp_rcb_free: freeing rcbp 0x%x\n", (u_int) rcbp));
 152         ATDISABLE(s, atpgen_lock);
 153         atp = rcbp->rc_queue;
 154         if ((rc_state = rcbp->rc_state) == -1) {
 155                 ATENABLE(s, atpgen_lock);
 156                 dPrintf(D_M_ATP, D_L_WARNING,
 157                         ("atp_rcb_free(%d): tid=%d,loc=%d,rem=%d\n",
 158                         0, rcbp->rc_tid,
 159                         rcbp->rc_socket.socket, atp->atp_socket_no));
 160                 return;
 161         }
 162         rcbp->rc_state = -1;
 163         rcbp->rc_xo = 0;
 164         rcbp->rc_queue = 0;
 165
 166         if (rcbp->rc_timestamp) {
 167                 extern struct atp_rcb_qhead atp_need_rel;
 168
 169                 rcbp->rc_timestamp = 0;
 170                 ATP_Q_REMOVE(atp_need_rel, rcbp, rc_tlist);
 171                 rcbp->rc_tlist.prev = NULL;
 172                 rcbp->rc_tlist.next = NULL;
 173         }
 174
 175         if (rcbp->rc_xmt) {
 176                 gbuf_freem(rcbp->rc_xmt); /* *** bad free is the second mbuf in this chain *** */
 177                 rcbp->rc_xmt = NULL;
 178                 for (i=0; i < rcbp->rc_pktcnt; i++)
 179                         rcbp->rc_snd[i] = 0;
 180         }
 181         if (rc_state != RCB_UNQUEUED) {
 182                 if (rc_state == RCB_PENDING) {
 183                         ATP_Q_REMOVE(atp->atp_attached, rcbp, rc_list);
 184                 } else {
 185                         ATP_Q_REMOVE(atp->atp_rcb, rcbp, rc_list);
 186                 }
 187         }
 188         if (rcbp->rc_ioctl) {
 189                 gbuf_freem(rcbp->rc_ioctl);
 190                 rcbp->rc_ioctl = NULL;
 191         }
 192         rcbp->rc_list.next = atp_rcb_free_list;
 193         atp_rcb_free_list = rcbp;
 194         ATENABLE(s, atpgen_lock);
 195 }